Measuring-pump.



J. B. DAVIS.

MEASURING PUMP.

APPLICATION FILED JUNE 10. I918- Patent-ed May 6, 1919.

UnrrED STATES PATENT OFFICE.

JOHN B. DAVIS, OF SPRINGFIELD, JMASSACHUSETTS, ASSIGNOR TO GILBERT 8r. BARKER MANUFACTURING COMPANY, OF WEST SPRINGFIELD, MASSACHUSETTS, A GQRPORA- T1011 OF MASSACHUSETTS.

MEASURING-PUMP.

eoaero.

Specification of Letters Patent. I Patented-May 6, 1919.

Application filed June 10, 1918. Serial No. 289,136.

Toall whom it may concern:

Be it known that 1, JOHN B. DAVIS, a citizen of the United States of America, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Measuring-Pumps, of which the following is a specification.

This invention relates to dispensing and measuring pumps and more particularly to dispensing and measuring pumps of the reciprocatory piston type. .The invention, as to certain features, also relates to improvements in pumps of the type set forth in my copending application Serial No. 152,642 filed March 6, 1917,

Dispensing and measuring pumps are now widely used for the dispensation of gasolene and like oils.- Their use as filling stations for automobiles is constantly increasing and, with this increasing use, a demand has-arisen for pumps of large capacity and pumps which may be operated more rapidly and eificiently than heretofore. Pumps of the reciprocating piston type have been found most satisfactory as measuring pumps, but, aocordmg to prior practice, in

creased difliculty and lessened convenlence of operation result when pumps of the reciprocating piston type are built in large sizes and employed in the manner above outlined.

An object of this invention is to. provide a measuring pump of the reciprocating piston type which is of generally lmproved construction to adapt it for convenient and efficient operation even when constructed in large sizes.

Another object of the invention is to provide a generally improved power operated measuring pump.

A further object of the invention is to provide, in a power operated measuring pump of the reciprocating piston type, im-

proved controlling means for arrestmg the delivery stroke of the pump when a desired and predetermined quantity of liquid has been pumped, the controlling means being characterized by their association with and actuation from the quantity stop supporting rod of the ump.

Other 0b]ects and advantages will appear in the following description and in the ap pended claims. 7

The invention is disclosed for illustrative pililrpfises in the accompanying drawings, in w 10 Figure l is a fragmentary sectional elevational view of a measuring pump embodying the invention;

Figs. 2 and 3 are sectional plan v1ews taken on the lines 22 and 33, respec- Fig. 6 is a fragmentary sectional plan view taken similarly to Fig. 2 and showing a modification;

Fig. 7 is a fragmentary exterior elevational view of a part shown in Fig. 2;

Fig. 8 is an enlarged fragmentary'sectional plan view taken on the line 8-8 of- Fig. 1; and

Fig. 9 is an enlarged fragmentary seotional plan View of a etail shown in Fig. 2. As an illustrative example of one pump with which the invention may be advantageously used, there has been shown in the drawings a measuring pump of the general type disclosed in my copending application Serial No. 152,642 filed March 6, 1917.

The pump illustrated, includes a pump cylinder a suitably held between, and capped at each end by, upper and lower header members 6 and 0 respectively. Within cyl inder a is a valved piston dand connected thereto is a piston rod e which is slidably supported in, and passes through, the upper header member I). The pump inlet pipe is shown at f and the discharge pipe at g, and

the arrangement of the pump parts is such ton. For a more complete disclosure of the pump proper reference may be had to the above named application.

The means for reciprocating the piston (I will next be described. The upper end of pitson rod 6 is fixed centrally to a cross head it and from each end of this cross head a piston rod 10 extends downwardly through the header member I; and into a cylinder 11 arranged alongside cylinder a. The lower end of each cylinder 11 is closed by the lower header member a while the upper end is open to the atmosphere. A valveless piston 12 is fixed to the'lower end of each piston rod 10 and the pistons 12 are adapted to be simultaneously forced upwardly to raise the main piston d by the admission of fluid under pressure to the lower ends of cylinders 11. Thus, the delivery stroke of the pump piston e is effected by power operated means and the return stroke is effected by the weight of the pistons, piston rods and cross head 72/, supplemented, if necessary by .a weight 2' placed upon the main pump piston d, as shown in Fig. 1.

The pump cylinder a, is preferably inclosed by asuitable casing A which extends between and is closed at its ends by the upper and lower header members I) and c. A casing B may be also provided as an inclosure for certain parts which are carried by the top of member I) and which will later be described in detail. A third casing C may be provided on casing B to inclose the rods 6 and 10 in their reciprocating movement. The casings A, B, and C have been illustrated merely in conventional form and their detailed construction may be such as is shown in the above identified application or any other suitable construction may be adopted as desired.

In order that accurately measured predetermined quantities of liquid maybe dispensed from the pump, means are provided to limit the stroke of the piston d. Thus, the cross head h has fixed thereto a rod 14 which extends downwardly through header member I) and into casing A and is arranged alongside the cylinder (1. A stationary rod 15 (Figs. 2 and 3) is arranged parallel with rod 14 and is suitably supported at its ends by the header members I) and a. A lug 16 fixed to the lower end of rod 14 has a bearing on the fixed rod 15 and the lower end of rod 14 is thus guided thereby, the upper end of rod 14 being guided by the header member I). Mounted in and extending between the header members 6 and c is a rod 18 and upon this rod, and preferably adj ustably secured thereto, in axially spaced relation are a plurality of quantity stops 7c. The

' upper of these stops is a circular disk,some

portion of which will always lie in the path of lug 16 irrespective of the angular position of rod 18. The upper stop therefore limits the stroke of piston d to define the maximum quantity which may be delivered from the pump. The other stops 7c limit the stroke of the piston d so that other measured quantities less than the capacity of the pump may the movements of handle be delivered. Each of the two lower stops it may be swung into or out of the path of lug 16 by turnin the rod 18. Thus, as shown in Fig. 8, t e two lower stops 7c are arranged at right angles, and a clockwise movement of rod 18 through an arc of ninety degrees will move one of the lower stops is out of the path of lug l6 and bring the other lower stop 70 into the path of this lug, while a counterclockwise movement of rod 18 through an arc of ninety degrees from the illustrated position will carryboth lower stops 70 out of the path of lug 16 leaving the upper stop to engage the latter. Any one of the several stops is may he moved into position to engage the lug 16 by means controllable fronr iwithout the, pump inclosing casings. Thus, a bevel gear 19 is slidably keyed (Fig. 4) to the upper end of the described rod 18 and the lower face of gear 19 rests upon the top of header member 12, whereby it is held from axial displacement in one direction. A bevel gear 20, fixed to the inner end of a shaft 21 mounted in casing B, meshes with gear 19 and holds the latter from upward axial movement. A handle 22 is fixed on the outer end of shaft 21 whereby rod 18 may be turned. Shaft 21 also carries a pointer 23, which plays over a suitably graduated scale 24 fixed to the exterior of easing B, whereby 22 necessary to carry any of stops 7: into position to engage lug 16 may be definitely ascertained. Preferably, for the sake of improved appearance,

and 5). A pipe 26 connects this valve to a source of fluid under pressure and the ipe is preferably concealed, as indicated in ig.

1, within the casings A and B and extends to the source of supply by way of the base of the pump. From valve 25 a pipe 27 extends downwardly through header member within casing A and connects with a pipe 28, which as shown in Figs. 1 and 3 delivers into the lower ends of the two cylinders 11. The valve 25 also has a port 29 (Fig. 2) which communicates with the atmosphere. The valve 25, being generally well understood, has not been illustrated in detail and, for an understanding of the present invention, it will suffice to state that it is arranged to be moved to one position to connect pipes 26 and 27, whereby fluid under pressure may be admitted to cylinders 11 to 30 i a stop support raise pistons 12, and to be moved to another position to connect pipe 27 to the atmosphere, whereby the fluid in-cylinders 11 may be exhausted to' permit the pistons 12 and d to descend by gravity.

The valve may be turned to efi'ect the functions just set forth by its shaft and this shaft may conveniently be turned from outside casing B by a handle 31, which is preferably connected with the shaft 30 for convenient removal as shown in Fig. 9. The shaft 30 ma releasably be held, in such position that t e pipes 26 .and 27 are connected, by a spring pressed latch 33 (Figs. 4 and 5) which is arranged to engage and hold one arm of a bell crank lever 34 fixed on shaft 30. The other arm of lever 34 may be used as a handle, if desired, when access is-permitted to casing B, and is urged to the left (1F ig. 1) by a spring 35. The arrangement is such that shaft 30 will be turned by reaupwardly a predetermined distance when.

son of spring 35 to connect. pipe 27 with the exhaust port 29 whenever the latch 33 is withdrawn fromholding engagement with the bell crank 34.

The release of latch 33 may be eflected autom-atically as soon as the. desired measured quantity of liquid has been dispensed from the pump b means-which combine with and are operab e from the described quantity rod 18. This rod is slidable axially upwar to the extent permitted by the engagement of a collar 36 thereon with a hub on the under face of header member 6, as shown in Figs. 1 and 4. A spring 37, arranged between the collar and such hub, normally holds rod 18 to its seat in header member 0, but permits the rod to be moved the lug 16 engages any one of the quantity stops k. A lever 38, pivoted intermediate its ends to a, bracket 39 on header member 6, has one end so disposed as to overlie a lug 40 on latch 33 and its other end lies in the slotted upper end of the rod 18. Thus, the

slight upward sliding movement of rod 18 is 7 made to-actuate the lever 38 and such lever is adapted to depress lug 40, thus disengaging latch 33 from the ell crank lever 34, whereby the latter may be moved by spring 35 to turn valve 25 into such position that the ipe 27 is connected to the ort 29.

T e release of latch 33 may a so be eflected manually from without theeasing B. Thus, a rod 41 having a hooked end to engage a pin 42 on latch 33 (Fig. 5) is slidably mounted in casing B (Fig. 2) and may be pulled outwardlyby a handle 43 to release lever 34 from the latch 33. Suchmanual release is impending overflow, the handle 43 may be pulled outwardly to stop the pump before the overflow takes place.

In operation, the rod 18 is turned until the deslred stop is is set so as to engage the lug 16 and such setting may conveniently be made from outside the casin by the "handle 22. Having set the stops, t e handle 31 is turned to the right until the lower arm of the bell crank lever 34 is carried into holding engagement with latch 33. Such movement of the handle 31 turns the valve shaft 30 and sets the valve so that fluid under pressure may enter pipes 27 and 28 and thus cylinders 11. Thereu on the two pistons 12 are simultaneously li ed in their cylinders and eflect the upstroke of the pump piston 03. ()n continued upward movement of the latter, the upwardl traveling lug 16 eventually engages the se ected stop is and log abutment with the latter raises rod 18 to t e extent permitted by spring 37 and collar 36. The raising of rod 18 hits the right hand end of lever 38, thereby depressing the :other end and the lug 40 on latch 33. Thus,

idly moved by spring 35 to turn the valve 25 until the cylinders 11 are connected through pipes 27 and 28 to the exhaust port 29. The upstroke of pump piston d is thus automatically stopped and the arresting ot' the piston'may, byadjustment of the stops k, be made to occur precisely at the time when the desired predetermined quantity of liquid has been pumped. As soon as the cylinders 11 are connected to the exhaust 'port 29,the pistons 12 and piston 03, descend by gravity, the weight of the parts and that of member 71 being made suificient for this purpose.

Thus, an improved power operated meas uring and dispensing pump has been provided Which is characterized, among other things, in that the pump may be automaticall stopped, as soon as the desired measciprocable with the latter to engage said.

stop, means actuated by. fluid pressure to lift the pump piston, supporting means for said stop constructed to permit the latter to yield a predetermined distance when engaged by the first named means, a two way valve manually movable to a position wherein fluid is admitted to said second named means to lift the pump piston, a latch to 'the bell crank lever 34 is released and is rapreleasably hold said valve in said position, means operable by the yielding of said stop to withdraw the latch from holding engagement with said valve, and means to automatically return the latter to another position wherein fluid may be exhausted from said actuating means.

2. Ina reciprocating piston pump, a plurality of stops any one of which may be set in position to limit the stroke of the piston, means reciprocable with the latter to engage said stops, means actuated by fluid pressure to lift the pump piston, supporting means for said stops constructed to permit the lat ter to yield a predetermined distance when engaged by the first-named means, a two way valve manually movable to a position wherein fluid is admitted to said second named means to lift the pump piston, a latch to releasably hold said valve in said position, means operable by the yielding of said stops to withdraw the latch from holding engagement with said valve, and means to automatically return the latter to another position wherein fluid may be exhausted from said second named means, a casing within which all the described elements are concealed and inclosed, means manually operable from outside the casing to set any desired stop into position to be engaged by said reciprocable means, and means manually operable from outside the casing to move said valve to its first-named position.

3. In a reciprocating piston pump having suflicient weight associated with its reciprocating parts to cause the pump piston to automatically move from upper to lower position, means actuated by fluid pressure to lift the piston, a valve manually movable to one position to admit fluid under pressure to said means and automatically movable to another position to permit exhaustion of such fluid from said means, means to releasably hold the valve in the first position, a plurality of quantity stops any one of which may be set to limit the stroke of the piston, means reciprocable with the latter to engage the set stop, and means operable by the engagement of the set stop with the reciprocable means to release the valve holding means. a

4. In a reciprocating piston pump, power operated mechanism to lift the piston for its delivery stroke, the return stroke being effected by gravity, a controlling devive movable from one position to another to start said mechanism, a plurality of quantity stops, any one of which may be set to limit the delivery stroke of the piston, means reciprocable with the latter to engage the set stop, means automatically operable when the set stop is engaged by the reciprocable means to restore said device to its original position to stop said mechanism and permit the piston to descend by gravity, a casing within which all the foregoing elements are inclosed and concealed, means manually operable from outside the casing to set any desired stop into position to be engaged by the reciprocable means, and means manually operable from outside the casing to move said controlling device.

5. A dispensing apparatus. comprising. a pump piston and cylinder, a header member on the upper part of said cylinder, a pump piston rod extending upwardly through said member, a cross head connected to said rod above the header member, cylinders arranged alongside the pump cylinder and below the header member, pistons for said last-named cylinders connected to actuate said cross head, a two-way valve carried by the header member and manually movable to one position to admit fluid to said last-named e \-linders, a latch carried by said member to releasably hold the valve in said position, a rod mounted in parallel relation with the pump cylinder and having a part. extending above said member, a stop on said rod to limit the stroke of the pump piston, means reciprocable with the latter to engage said stop, a lever pivoted to said member and having a part overlying said rod and another part engageable with said latch, means permitting said rod to yield axially a predetermined distance when engaged by said rociprocable means, whereby the engagement of the latter and said stop withdraws the latch from holding engagement with said valve, and means to automatically return the released valve to another position to permit the exhaustion of fluid from the last-named c linders.

y JOHN B. DAVIS. 

